Great News ! Great for You!

My suggestion is to now work on a full body base fitness program.
As I noted in my earlier post, spend the next few months improving your cycling 'efficiency' (which balances Muscle and Cardio loading).
'Periodization' - I Human body can't produce it's best ALL YEAR LONG, Every year. Allowing the body to work thru waves of intensity produces the best results.
Some 'periodize' for certain events, some for a particular part of a year or season...
Because my 'Winter' activity is quite intense - All forms of skiing and played Ice Hockey until my cancer diagnosis in '19, Late Spring was always a planned 'reccovery' and then periodized again for July, Aug & Sept.
Doesn't mean I did nothing. I rode a lot, hiked a lot, Skated alot - But 'fun' was as important as 'Focus'... These days it's mostly fun most of the time- inevitable at 76.
'Cycling Efficiency'
Is Muscle strength, which comes from Cardio systems suppling the needs of the muscles
AND
The muscle exertion coordination to maximize the power applied to the pedals.
This is the trading of muscle forces from one leg to the other, in the pedal stroke. 'SPIN'. Cadence.
The faster you can spin the pedals, the lower the power requirement in each pedal stroke - reducing muscle fatigue over time.
There are points where the 'Cadence' becomes in-efficient, becauses the muscles 'block' the quick, efficient effort of pedaling force exchange.
The point of 'spinning a lower gear' is to train the muscles to improve that force exchange.
'Base/Off season' riding is one time when that is best done.
'SLower' Riding, higher steady cadence (which you increase over weeks and months, not days).
Rode SLOWER, pedal faster, for a longer period of time... Maybe one day of the week (if you ride at least 5 days/wk), add a little 'Intensity' into a session - you'll start seeing a big difference.
Beating yourself up on most rides DOESN'T work...
https://usacycling.org/article/slowi...n-to-go-faster
'aerobic riding' in this article also refers to developing a good, broad cadence range - spin.

Ride On
Yuri